JP2003185377A - Plate fin-type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the durability of plates and fins. <P>SOLUTION: In this plate fin-type heat exchanger wherein plates 5 and fins 7 are alternately stacked, the plates 5 are provided with round shaped recessed parts 51 more gentle than the round shape of projecting parts 71 of the fins 7, on their faces opposite to the fins 7, and tips of the projecting parts 71 of the fins 7 are brought into contact with the recessed parts 51 without being joined and fixed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate fin type heat exchanger constructed by alternately laminating plates and fins having uneven shapes.

[0002]

2. Description of the Related Art Generally, a plate fin type heat exchanger is
Spaces between the plates in which the corrugated fins are housed are configured such that high-temperature fluid passages and low-temperature fluid passages are alternately arranged in the stacking direction, and high-temperature fluids and low-temperature fluids are provided in the respective fluid passages. The heat exchange is performed between the high-temperature fluid and the low-temperature fluid by each flowing. The plate and the fin are joined and fixed at the mutual contact portion.

[0003]

By the way, there is a temperature difference between the high temperature fluid and the low temperature fluid as a matter of course, and a sharp temperature gradient occurs at the inlet and outlet of the high temperature fluid. Therefore, as described above, when the plate and the fins are bonded and fixed to each other, the difference in thermal expansion between the high temperature portion and the low temperature portion causes stress on the plate and the fins, resulting in cracking. This leads to a decrease in sex.

Therefore, an object of the present invention is to improve the durability of plates and fins.

[0005]

In order to achieve the above object, the invention of claim 1 is a plate fin type heat exchanger configured by alternately laminating plates and fins having irregular shapes. A concave portion is formed on the surface of the fin facing the fin, and the concave portion and the convex portion of the fin are movably in contact with each other.

According to a second aspect of the invention, in the configuration of the first aspect of the invention, the concave portion of the plate has an R shape that is gentler than the R shape of the convex portion.

According to a third aspect of the present invention, in the structure of the first or second aspect of the invention, an elastic means is interposed between the concave portion of the plate and the convex portion of the fin.

According to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, between the plates,
The fin is elastically deformed in the direction of being pressed by the plate.

According to a fifth aspect of the present invention, in the structure of any one of the first to fourth aspects, the fin is provided with a gather portion which is elastically deformable in the stacking direction.

According to a sixth aspect of the present invention, in the structure according to any one of the first to fifth aspects, the plate is provided with a gather portion which is elastically deformable in the stacking direction.

According to a seventh aspect of the present invention, in the structure according to any one of the first to fifth aspects, the plate is provided with a gather portion which is elastically deformable in a direction parallel to the surface thereof.

According to an eighth aspect of the present invention, in the structure of any one of the first to seventh aspects, the fins have an uneven shape in a direction parallel to the surface of the plate and in two directions orthogonal to each other. It is provided as a configuration.

According to a ninth aspect of the present invention, in the structure of the eighth aspect, the tip of the convex-concave convex portion is formed in a flat surface.

According to a tenth aspect of the present invention, in the structure according to any one of the first to ninth aspects, a part of the plurality of contact portions where the plate and the plurality of convex portions of the fin contact each other is joined. It is configured as a fixed part.

According to an eleventh aspect of the present invention, in the structure according to any one of the first to ninth aspects, one of the two plates located on both sides of the fin and the contact portion of the fin are joined and fixed. It is designed as a part.

[0016]

According to the first aspect of the present invention, since the concave portion is formed on the surface of the plate facing the fin and the tip of the convex portion of the fin is movably contacted with the concave portion, the heat exchanger can be used as a heat exchanger. While ensuring the original function of the plate by the contact between the plate and the fin, it absorbs the deformation of the plate and the fin due to the difference in thermal expansion between the high temperature part and the low temperature part, and It is possible to prevent the occurrence of cracks and the like, and it is possible to improve durability.

According to the second aspect of the present invention, since the concave portion of the plate has an R shape that is gentler than the R shape of the convex portion of the fin, the fin can surely come into contact with the plate.

According to the invention of claim 3, the elastic means between the concave portion of the plate and the convex portion of the fin improves the deformation absorbing action of the plate and the fin, and the contact state between the plate and the fin is elastic means. Improve more through.

According to the fourth aspect of the present invention, the contact state between the plate and the fin becomes more reliable through the elastically deformed fin interposed between the plates.

According to the invention of claim 5, the gather portion provided on the fin improves the deformation absorbing action of the plate and the fin, and improves the contact state between the plate and the fin.

According to the sixth aspect of the invention, the gather portion provided on the plate and elastically deformable in the stacking direction improves the deformation absorbing action of the plate and the fin, and also improves the contact state between the plate and the fin.

According to the invention of claim 7, the gathering portion provided on the plate and elastically deformable in the direction parallel to the plate surface improves the deformation absorbing action of the plate and the fins.

According to the invention of claim 8, since the fins are provided with the concavo-convex shape in a direction parallel to the surface of the plate and in two directions orthogonal to each other, the fins are parallel to the surface parallel to the surface of the plate. Therefore, the elastic deformation in multiple directions is easy, and the deformation caused by the difference in thermal expansion between the high temperature portion and the low temperature portion can be easily absorbed.

According to the ninth aspect of the present invention, since the fin having the projection tip as a flat surface has the uneven shape in the direction parallel to the surface of the plate and along the two directions orthogonal to each other, the plate It is easy to expand and contract in multiple directions along a plane parallel to the plane, and the deformation due to the difference in thermal expansion between the high temperature portion and the low temperature portion can be easily absorbed.

According to the tenth aspect of the present invention, since a part of the contact portion between the plate and the fin is bonded and fixed, the plate and the fin due to the difference in thermal expansion between the high temperature portion and the low temperature portion. The deformation is absorbed by the contact portion which is not joined and fixed, the thermal stress of the plate and the fin is reduced, cracks and the like can be prevented from occurring, and durability can be improved.

According to the eleventh aspect of the present invention, the contact portion between one of the two plates located on both sides of the fin and the fin is joined and fixed. Deformation of plates and fins due to the difference in thermal expansion of
The plates and fins are absorbed by the contact portions that are not joined and fixed, and the thermal stress of the plate and the fins can be reduced to prevent the occurrence of cracks and the like, thereby improving the durability.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an essential part of a plate fin type heat exchanger showing a first embodiment of the present invention.
[Fig. 3] is a perspective view showing an overall configuration of a plate fin type heat exchanger. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is taken along line B- of FIG.
It is a B sectional view. This plate fin type heat exchanger has a rectangular parallelepiped shape as a whole, and a plate 5 and a wave as shown in a perspective view in FIG. 5 are provided between the uppermost end plate 1 and the lowermost end plate 3. Fins 7 having an uneven shape of the mold are alternately laminated in the vertical direction in FIG.

The plate 5 has a plate thickness of about 0.3 mm, the fins 7 have a plate thickness of about 0.05 mm, and the material is SUS304. The distance between the plates 5 is
The length is 1 to 2 mm, and the fins 7 are housed in this space in a state of simply contacting the plate 5 without being joined and fixed.

The fin 7 immediately below the end plate 1 is a corrugated plate having unevenness repeated in the X direction in FIG. 2, and the fin 7 below it is a corrugated plate having unevenness repeated in the Y direction in FIG. Is. Hereinafter, the respective corrugated plates are alternately arranged in the stacking direction. In FIG. 2, a corrugated plate having irregularities repeated in the X direction is indicated by reference numeral 7 (7a), and a corrugated plate having irregularities repeated in the Y direction is indicated by reference numeral 7 (7b).

The space in which the fins 7 (7a) are housed is the low temperature fluid flow path 9 through which the low temperature fluid flows. On the other hand, fin 7
The space in which (7b) is housed is the high temperature fluid flow path 11 through which the high temperature fluid flows. Then, heat exchange is performed between the low temperature fluid flowing through the low temperature fluid flow path 9 and the high temperature fluid flowing through the high temperature fluid flow path 11.

The plate fin type heat exchanger described above is provided with a partition wall 13 on the right side in the X direction in FIG. 2, which divides the whole into two parts. It is divided into an exchange unit 17. However, this partition wall 13
Is not provided in the high temperature fluid flow passage 11 provided with the fins 7b, and the high temperature fluid flow passage 11 is not divided.

A first cover 19 is provided on the front side of the first heat exchange section 15 in FIG. 2, and a second cover is provided on the front side of the second heat exchange section 17 in FIG. Cover 21
But they are installed respectively. The inside of the first cover 19 and the inside of the second cover 21 are partitioned by the partition wall 13 described above to form mutually different spaces 23 and 25 (see FIGS. 3 and 4). In addition, a rear cover 27 that covers the entire first heat exchange unit 15 and the second heat exchange unit 17 is attached to the back side of the paper in FIG. Inside the rear cover 27, the partition wall 13 is not provided, and the entire space forms one space 29 (see FIGS. 3 and 4).

A low temperature fluid inlet 31 for allowing a low temperature fluid to flow into the space 23 in the first cover 19 is formed on the upper surface of the first cover 19, and an upper surface of the second cover 21 after heat exchange is formed. A low temperature fluid outlet 33 is formed to let the low temperature fluid flow out.

As shown in FIG. 3, the low temperature fluid flowing from the low temperature fluid inlet 31 into the space 23 in the first cover 19 is
It flows through the low temperature fluid flow path 9 in the first heat exchange section 15, and once flows out into the space 29 in the rear cover 27. As shown in FIG. 4, the low temperature fluid flowing out into the space 29 flows through the low temperature fluid flow path 9 in the second heat exchanging portion 17 in the direction opposite to that of FIG. 3 and into the space 25 in the second cover 21. It flows out and flows out from the low temperature fluid outlet 33 to the outside. FIG. 6 is a schematic plan view showing how the low temperature fluid flows.

Note that FIGS. 3 and 4 are schematic views for explaining the flowing state of the low temperature fluid, and do not match the number of stacked plates and fins shown in FIG.

On the other hand, as shown in FIG. 8, which is a schematic plan view of FIG. 7 and a partial sectional view corresponding to the CC cross section of FIG. Flows in one direction from the right side to the left side in FIGS. 7 and 8. Note that FIG. 8 is a schematic view for explaining the flowing state of the high and low temperature fluid, and does not match the number of irregularities of the fin 7 shown in FIG.

The low temperature fluid flows through the low temperature fluid passage 9 as shown in FIGS. 3, 4 and 6, while the high temperature fluid flows through the high temperature fluid passage 11 as shown in FIG. Heat is exchanged between the two.

In the process of performing such heat exchange operation, as a matter of course, there is a temperature difference between the high temperature fluid and the low temperature fluid, and the second heat exchange section 17 on the side where the high temperature fluid flows in is , The first heat exchange section 15 on the outflow side of the high-temperature fluid
The temperature becomes higher than that, and a steep temperature gradient is generated between the heat exchange units 15 and 17. Therefore, in the heat exchanger, a difference in thermal expansion occurs between the high temperature portion and the low temperature portion.

FIG. 1 shows the sectional structure of the plate 5 and the fin 7 in FIG. 8 in more detail. First,
The low temperature fluid flow path 9 will be described. In the portion of the plate 5 in the low temperature fluid flow path 9 corresponding to the convex portion 71 of the fin 7, the concave portion 5 extending in the direction orthogonal to the paper surface in FIG.
1 is formed, and the convex portion 71 and the concave portion 51 are not joined and fixed to each other, but are simply in contact with each other. Also, the recess 5
No. 1 has an R shape that is gentler than the R shape of the convex portion 71, whereby a good contact state between the concave portion 51 and the convex portion 71 is ensured.

On the other hand, the fins 7 in the high temperature fluid passage 11
For (7b), the fins 7 (7
A recess 52 similar to the above-described recess 51 is formed in the region on the side opposite to a) in the left-right direction in FIG. 1, and the projection 72 of the fin 7 (7b) is It is not joined and fixed, but simply in contact.

In this way, the fins 7 on the plate 5 are
Since the tips of the projections 71 of the fins 7 are simply brought into contact with the recesses 51 formed on the surface facing the above, while ensuring the original function of the heat exchanger by the contact between the plate 5 and the fins 7, As described above, even if a difference in thermal expansion occurs between the high temperature portion and the low temperature portion, the plate 5 and the fins 7 absorb the deformation caused by the difference in thermal expansion and the thermal stress is reduced.
As a result, the plate 5 and the fins 7 are prevented from being damaged by cracks or the like, and the durability is improved.

FIG. 9 is a sectional view showing a second embodiment of the present invention, which corresponds to FIG. This embodiment differs from the embodiment of FIG. 1 in that the recesses 51 and fins 7 of the plate 5 are
The elastic means 35 is interposed between the convex portion 71 and the convex portion 71. An elastic force acts on the elastic means 35 in a direction to separate the plate 5 and the fin 7 from each other. In addition, in FIG.
Although only the low temperature fluid flow path 9 side is illustrated in detail,
Also on the high temperature fluid passage 11 side, the recess 52 of the plate 5 is formed.
The elastic means 35 is interposed between and the convex portion 72 of the fin 7 (b).

The elastic means 35 may be a hardened stainless wire, a flat plate bent into two as shown in FIG. 10, or a leaf spring bent into a bellows shape. The material of each elastic means 35 is the same as that of the plate 5 and the fin 7.

By interposing the elastic means 35, the deformation absorbing action of the plate 5 and the fins 7 can be improved to contribute to the improvement of the durability, and the contact state between the plate 5 and the fins 7 can be improved by the elastic means 35. It becomes more reliable and the original function of the heat exchanger is reliably maintained.

FIG. 11 is a sectional view showing a third embodiment of the present invention and corresponding to FIG. This embodiment is
Compared with the embodiment of FIG. 1, the fins 7 are in a state of being elastically deformed by being pressed by the plates 5 on both sides thereof. Specifically, the fin 7 is (4/5) h in height after the elastic deformation, that is, in the state of being interposed between the plates 5, with respect to the height h before the elastic deformation. In addition, in FIG.
Although only the low temperature fluid flow path 9 side is illustrated in detail,
Also on the high temperature fluid flow path 11 side, the fins 7 (b) are pressed by the plates 5 on both sides thereof and are elastically deformed.

As a result, the contact state between the plate 5 and the fins 7 becomes more reliable by the elastically deformed fins 7, and the original function of the heat exchanger is reliably maintained.

FIG. 12 is a sectional view corresponding to FIG. 1 showing a fourth embodiment of the present invention. This embodiment is
1, the fin 7 is provided with a gather portion 73 that is elastically deformable in the stacking direction of the plate 5 and the fin 7. The fins 7 here are interposed with the gathers 73 elastically deformed in the compression direction. In FIG. 12, only the low temperature fluid flow path 9 side is shown in detail, but the fin 7 (7b) is also provided with a gather portion on the high temperature fluid flow path 11 side.

As a result, the deformation absorbing action of the plate 5 and the fins 7 can be improved to contribute to the improvement of durability, and the contact state between the plate 5 and the fins 7 can be improved.
The elastic deformation of 3 makes it more reliable, and the original function of the heat exchanger is reliably maintained.

FIG. 13 is a sectional view showing a fifth embodiment of the present invention and corresponding to FIG. This embodiment is
Between the concave portions 51 of the plate 5, gather portions 53 that are elastically deformable in the vertical direction in FIG. 13 are provided. The plate 5 here is assembled in a state where the gather portion 53 is elastically deformed in the compression direction.

As a result, the deformation absorbing effect of the plate 5 and the fins 7 can be improved to contribute to the improvement of durability, and the contact state between the plate 5 and the fins 7 can be improved.
The elastic deformation of 3 makes it more reliable, and the original function of the heat exchanger is reliably maintained.

FIG. 14 is a sectional view corresponding to FIG. 1 showing a sixth embodiment of the present invention. This embodiment is
Between the recesses 51 of the plate 5, gathers 55 which are elastically deformable in the left-right direction in FIG. 14 are provided. Here, the plate 5 is assembled with the gather portion 55 elastically deformed in the compression direction.

As a result, the deformation absorbing action of the plate 5 and the fins 7 is improved, which contributes to the improvement of durability.

Although the gather portions 53 and 55 in FIGS. 13 and 14 are integrated with the plate 5, they may be assembled to the plate 5 as separate parts.

FIG. 15 is a sectional view corresponding to FIG. 1 showing a seventh embodiment of the present invention. This embodiment is
A part of a plurality of contact portions between the plate 5 and the fins 7 is a joining fixing portion 37 joined by brazing or the like. Specifically, the contact portions of the fins 7 on one side with respect to the plate 5 are arranged such that the joining fixing portions 37 and the contact portions in a state of simply contacting each other are alternately arranged. In addition,
In FIG. 15, only the low temperature fluid flow path 9 side is shown in detail, but also on the high temperature fluid flow path 11 side, a part of the plurality of contact portions between the plate 5 and the fins 7 is joined and fixed to the fixing portion 37. And

FIG. 16 is a sectional view corresponding to FIG. 1 showing an eighth embodiment of the present invention. This embodiment is
All of the plurality of contact portions between the fins 7 and the plate 5 on one side (the lower side in FIG. 16) are joint fixing portions 37. All the contact portions between the fins 7 and the plate 5 on the other side (upper side in FIG. 16) are merely in contact with each other. Although FIG. 16 shows only the low temperature fluid flow path 9 side in detail, all of the contact portions between the fins 7 and the plate 5 on one side are joined and fixed to the high temperature fluid flow path 11 side. All the contact portions between the fins 7 and the plate 5 on the other side are simply in contact with each other.

As shown in FIGS. 15 and 16, even if a part of the contact portion between the plate 5 and the fin 7 is fixed by joining, the plate 5 and the fin 7 are contacted with each other only by the contact portion. The thermal stress is reduced by absorbing the deformation caused by the difference in thermal expansion.

15 and 16, the joint fixing portion 37 may be the entire area in the longitudinal direction of the convex portion 71 orthogonal to the paper surface, or may be a part in the longitudinal direction. See also FIG.
5, the joint fixing portion 37 may be provided to the plate 5 on one side as shown in FIG.
In FIG. 6, as shown in FIG. 15, the joining fixing portion 37 and the contact portion in the state of simply contacting may be alternately formed.

FIG. 17 is a perspective view of the fin 7 showing the ninth embodiment of the present invention. This fin 7 is, as shown in FIG. 18 which is a sectional view taken along line DD or EE in FIG.
It has a concavo-convex shape that forms a sinusoidal waveform in a direction parallel to the surface of the plate 5 and orthogonal to each other in FIG. 17 along the X direction and the Y direction. FIG. 19 shows a state in which the above-mentioned fins 7 are housed between the plates 5.

Such fins 7 can easily expand and contract in multiple directions along a plane parallel to the plane of the plate 5, sufficiently absorb the deformation caused by the difference in thermal expansion, and reduce the thermal stress.
Damage due to cracks is prevented and durability is further improved.

FIG. 20 is a perspective view of the fin 7 showing the tenth embodiment of the present invention. This fin 7 is shown in FIG.
21, which is a cross-sectional view taken along line FF or GG of FIG. 21, is upside down in the direction parallel to the plane of the plate 5 and along the X and Y directions in FIG. It has a concavo-convex shape such that a trapezoid that becomes

That is, in this fin 7, the tip end of the convex-concave portion is formed on the flat surface 39. Corresponding to the flat surface 39, the recess on the plate 5 side is also a flat surface 41. FIG. 22 shows a state in which the fins 7 shown in FIG. 21 are housed between the plates 5.

Similar to that of FIG. 17, the fin 7 as described above is easily stretchable and deformable in multiple directions along a plane parallel to the plane of the plate 5, and sufficiently absorbs the deformation caused by the difference in thermal expansion. As a result, thermal stress is reduced, damage due to cracks and the like is prevented, and durability is further improved.

The fin 7 according to each of the embodiments shown in FIGS. 17 and 20 may be provided with a gather 73 as shown in FIG.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a plate fin type heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the overall configuration of the plate fin type heat exchanger of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a perspective view of the fin of FIG. 1. FIG.

6 is a plan view showing how the low temperature fluid flows in the plate fin type heat exchanger of FIG. 1. FIG.

7 is a plan view showing how hot fluid flows in the plate fin type heat exchanger of FIG. 1. FIG.

FIG. 8 is a sectional view taken along line CC of FIG.

FIG. 9 is a sectional view showing a second embodiment of the present invention and corresponding to FIG.

FIG. 10 is a perspective view showing a specific example of the elastic means of FIG.

FIG. 11 is a cross-sectional view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 12 is a sectional view showing a fourth embodiment of the present invention and corresponding to FIG.

FIG. 13 is a sectional view showing a fifth embodiment of the present invention and corresponding to FIG.

FIG. 14 is a sectional view showing a sixth embodiment of the present invention and corresponding to FIG.

FIG. 15 is a sectional view showing a seventh embodiment of the present invention and corresponding to FIG.

FIG. 16 is a sectional view showing an eighth embodiment of the present invention and corresponding to FIG.

FIG. 17 is a perspective view of a fin showing a ninth embodiment of the present invention.

18 is a sectional view taken along line DD or EE in FIG.

FIG. 19 is a cross-sectional view showing a state in which the fin of FIG. 17 is housed between the plates.

FIG. 20 is a perspective view of a fin showing a tenth embodiment of the present invention.

21 is a sectional view taken along line FF or GG in FIG. 20.

22 is a cross-sectional view showing a state in which the fins of FIG. 20 are housed between the plates.

[Explanation of symbols]

5 plates 7 fins 35 Elastic means 37 Joining and fixing part 39 plane 51 recess 53,55,73 Gather 71 convex

Claims (11)

[Claims] 1. A plate fin type heat exchanger configured by alternately stacking plates and fins having uneven shapes, wherein a recess is formed on a surface of the plate facing the fin, and the recess and the fin are formed. A plate fin type heat exchanger characterized in that it is movably in contact with a convex portion. 2. The plate fin type heat exchanger according to claim 1, wherein the concave portion of the plate has an R shape that is gentler than the R shape of the convex portion. 3. The plate fin type heat exchanger according to claim 1, wherein an elastic means is interposed between the concave portion of the plate and the convex portion of the fin. 4. The plate fin type heat according to claim 1, wherein the fins are interposed between the plates in a state of being elastically deformed in a direction of being pressed by the plates. Exchanger. 5. The plate fin type heat exchanger according to claim 1, wherein the fin is provided with a gather portion which is elastically deformable in the stacking direction. 6. The plate fin type heat exchanger according to claim 1, wherein the plate is provided with a gather portion which is elastically deformable in the stacking direction. 7. The plate fin type heat exchanger according to claim 1, wherein the plate is provided with a gather portion which is elastically deformable in a direction parallel to the surface thereof. 8. The fin according to claim 1, wherein the fin has an uneven shape in a direction parallel to a surface of the plate and in two directions orthogonal to each other. Plate fin type heat exchanger. 9. The plate fin type heat exchanger according to claim 8, wherein a tip of the convex-concave shape convex portion is formed into a flat surface. 10. The joint fixing portion according to claim 1, wherein a part of a plurality of contact portions where the plate and the plurality of convex portions of the fin come into contact with each other is a joint fixing portion. Plate fin type heat exchanger. 11. The contact fixing part between one of the two plates located on both sides of the fin and the fin is a joint fixing part. Plate fin type heat exchanger.